CVE-2024-25581

2024-05-1400:00:00

ubuntu.com

dns over https

nghttp2 provider

assertion failure

zone transfer

tcp

dns over tls

do53

unix

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.0004 Low

EPSS

Percentile

9.1%

JSON

When incoming DNS over HTTPS support is enabled using the nghttp2 provider,
and queries are routed to a tcp-only or DNS over TLS backend, an attacker
can trigger an assertion failure in DNSdist by sending a request for a zone
transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop
and thus leading to a Denial of Service. DNS over HTTPS is not enabled by
default, and backends are using plain DNS (Do53) by default.